One: The machine was normal before the plane took off.
Two: normal maintenance.
Three: the crew is normal.
Four: the delivery is normal.
Five: The weather is normal.
Six: Communication was normal before the crash.
To sum up, it is very simple, that is, everything is normal. According to normal logic, the plane should be fine. Now the only thing hiding the truth is in two black boxes, but the data has not been recovered. The more so, the more suspicious it is, because this aircraft has two sets of operating systems as backup, one set is invalid, the other set can be operated as backup, and one set of steel cables is used as manpower backup. This kind of plane is far safer than some ordinary planes in safety. Moreover, the service time of this aircraft is only 6 years 10 month, which is a quasi-new aircraft in the aircraft, so the possibility of aging is ruled out.
The only point of this preliminary report is that the aircraft parts appeared at12km away. Why do they appear so far away? If the plane disintegrated in the air, did it encounter a collision in the air? Did you hit an unknown object at high altitude, or did you hit a big bird at low altitude, causing the plane to malfunction, or was it improper human operation?
In addition, why the plane fell vertically is also an important inference. First of all, it must be that the plane can't keep balance, so the big head will fall vertically. If the trailing edge of the right winglet farthest from the impact point falls off in the air, will it affect the overall balance of the aircraft?
To this end, I specially checked the aviation-related information. The winglet falls off at a distance of 12 km, which will not have a great impact on the balance of the aircraft. This winglet plays a role in reducing flight resistance and is also a relatively fragile component. If you encounter great resistance, such as rapid vertical drop, rapid pull-up and rapid drop, it will cause damage and fall off in the air. Of course, the final conclusion has to wait for the investigation of the Civil Aviation Administration. What I pointed out above is that winglets only happen under normal circumstances.
There is also a problem about the rapid descent of the aircraft, from 8900 meters to more than 3000 meters, which means that the engine power of the aircraft is completely lost and it is impossible to pull up, climb and slow down. If it is an engine failure, is it a problem that small parts falling from the plane enter the engine from the wing position and cause the engine to stop? I hope the Civil Aviation Administration of China can conduct an investigation as soon as possible, and we look forward to the final statement of the Civil Aviation Administration of China.